Rebecca Szymkowski, P.E., PTOE Wisconsin Department of Transportation. ITE Midwestern District Annual Meeting June 30, 2015

Transcription

1 Rebecca Szymkowski, P.E., PTOE Wisconsin Department of Transportation ITE Midwestern District Annual Meeting June 30, 2015

2 Strategic Highway Safety Plan (SHSP) Roundabout Safety Analysis J-turn Experiences Single-Point Interchange Experience Other Innovative/Interchange Considerations Other Intersection Safety Countermeasures Other Related Safety Initiatives Questions 2

3 1400 Wisconsin Traffic Fatalities by Year : National Traffic and Motor Vehicle Safety Act 1974: national 55mph speed limit 1982: OWI omnibus 1984: drinking age raised to : drinking age raised to : mandatory seatbelts 1980s: Created paved shoulder policy 1989: First edition Roadside Design Guide published 1995: Created Traffic Incident Management Enhancement Program 2000s: Began installing modern roundabouts 2003: prohibited BAC lowered to : Began installation of high tension cable barrier 2010: OWI omnibus 2009: primary enforcement of seatbelts, universal text ban 2012: GDL phone ban 2012: Created rumble strip policy

4 Wisconsin s Highway Safety Clock Traffic crash: every 5 minutes Property damage: every 6 minutes Injury: every 13 minutes Speed-related injury or death: every 1 hour Teen driver injured or killed: every 2 hours Alcohol-related injury or death: every 3 hours Motorcyclist injured or killed: every 4 hours Pedestrian injured or killed: every 7 hours Bicyclist injured or killed: every 9 hours Fatality: every 16 hours

5 October 2007 All 50 states and the District of Columbia have approved SHSPs Unprecedented collaboration and cooperation Multidisciplinary plans representing the 4 E s of Safety (Engineering, Enforcement, Education, EMS) Fifth E = Everyone

6 Wisconsin SHSP VISION: Zero in Wisconsin Overarching safety document for the state For WisDOT, guides/integrates with other safety documents/programs Highway Safety Plan (HSP) Highway Safety Improvement Program (HSIP) Commercial Vehicle Safety Plan (CVSP) Freight Plans Bike/Pedestrian Plans Others

7 SHSP is a living document 4 Editions (current) Sponsorship of WisDOT s Traffic Safety Council (TSC) GOAL: Reduce traffic fatalities, injuries, and crashes on Wisconsin roadways by 5% from their rolling 5-year averages.

8 Highest Priority Issue Areas (Behavioral) Reduce Driver Distraction Reduce Alcohol and Drug Impaired Driving Reduce Motorcycle Crashes Increase Seat Belt Use and Improve Child Safety Seat Use Curb Aggressive Driving/Reduce Speed Related Crashes Provide Safe Bicycle and Pedestrian Travel

9 Highest Priority Issue Areas (Engineering) Improve Design and Operations of Intersections Reduce Lane Departure/Run-off-the-road Crashes Improve Incident Management and Travel in Bad Weather Continuing Priority Issue Areas Create Safer Work Zones Wisconsin Statistics (08-12) 37% of all Crashes 29% of all traffic fatalities 50% of all non-fatal injuries 39% of all incapacitating injuries

10 Task within issue area: Develop/implement solutions to reduce (total and severity of) intersection crashes. Various geometric configurations that will help with this task include: Roundabouts J-turns Jug handles Diverging diamond/single-point interchanges Others (flashing yellow arrow, intersection conflict warning systems, etc)

11 Research Safety Study Year Study Completed Years Roundabout Built No. of Years of Before Crash Data No. of Years of After Crash Data Phase and before Phase and before Phase 3 (current) In Progress 2009 and before

12 As of 2008, 40 RABs within WisDOT oversight (30 included in evaluation) Data Crash: 3-4 years before and after Traffic volume: before and after Methodology Empirical Bayes (Highway Safety Manual methodology) Crash Analysis

13 Total Crashes KABC Crashes Singlelane Multilane Number of RABs RABs with Increased Crashes 8 9 RABs with Decreased Crashes 7 6 Total Expected Crashes Total Observed Crashes % of Changes 4% -19% RABs with Increased Crashes 7 3 RABs with Decreased Crashes 8 12 Total Expected Crashes Total Observed Crashes % of Changes 33% 41%

14 Significant decrease in crash severity 0 locations had fatal crashes in after period 21 locations decreased in injury crashes 9 locations increased in injury crashes Overall, 38% decrease for fatal and injury crashes Total Crash Frequency 13 locations decreased or no change 17 locations increased 5 of 17 increased from 1 to 3 crashes Overall, 12% increase

15 Commonalities between roundabouts that have safety concerns Failure to yield to ALL lanes Incorrect lane choice on the approach High Speed

16 Typical Application: Low to medium side-street thru/left volume divided expressways Reduces crash potential (particularly far side right angle crashes) Can accommodate up to two times the volume when compared to traditional median crossover type Easily retrofitted without purchasing additional R/W Low to medium cost Non signalized treatment Requires special signing Requires public education Creates indirect movements Creates mainline weaving movements

17 Operational Characteristics Minor road traffic turns right only Minor street left-turns and through required to U-turn downstream

18 Three J-turns currently installed, many in planning and/or design Preliminary Safety Results Intersection US 53 & County B Open Date October 2011 Right Angle Injury / Fatal Property Damage Only WIS 29 & County VV WIS 23 & County M July 2013 November

19 NW Region Added: Diagrammatic guide signs for CTH B Flex tubes to prevent median crosscutting

20 NE Region Loon - vehicles using to stage the turn instead of single movement Original Design Revised Design No lighting installed crashes only during day Sign placements to avoid farm machinery

21 Typical Application: Service interchange between a freeway and a high-volume arterial with both heavy left turns and through movements Simplified signal phasing Increased capacity for all movements Operates well with closely spaced signalized corridor Safer design 18 vehicle conflict points Requires large structure Longer clearance times Pedestrian traffic must be low No ramp off/ramp on movements allowed Interchange layout is unfamiliar to drivers

22 SPI Signal Operations 3-Phase Signal Operation

23 Three locations in Wisconsin 1 opened in under construction 1 in planning US 53 & STH 12 US 12/18 & US 151

24 Signal Monotube USH 53 NB 53 USH SB OTTER RD

25 Field changes prior to opening: Supplemental far side signals heads

26 Field changes prior to opening: Grooved left turn guide markings

27 Has performed well No formal operation or safety complaints Average Crashes 12 crashes per year 8 rear end crashes per year Low severity Current ADT s USH 53: 34,000 VPH USH 12: 20,000 VPH

28 Diverging Diamond Interchanges 7 DDIs in planning or design stages

29 Echalon Interchange (one in planning stage) Continuous Flow Intersections Source: Utah DOT

30 Signal Head per Lane/Flashing Yellow Arrow Study starting to evaluate signalhead-per-lane and flashing yellow arrow safety benefits 30

31 Through-route Activation Warning System (TRAWS) Part of Intersection Conflict Warning Systems (ICWS) applications Use on 4- lane divided expressways 31

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33 Update MV4000 crash report form - improve data Identify new tools to help with safety evaluation (i.e., Highway Safety Manual/SafetyAnalyst, RSAP, IHSDM, LiDAR, etc.) Continued outreach (roundabouts, innovative intersection/ interchanges, safety benefits, etc.)

34 Rebecca Szymkowski, P.E., PTOE Wisconsin DOT